996216661 has 8 divisors (see below), whose sum is σ = 1089900000. Its totient is φ = 903053040.

The previous prime is 996216649. The next prime is 996216707. The reversal of 996216661 is 166612699.

It is the 12886-th star number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 996216661 - 2¹¹ = 996214613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996216161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125911 + ... + 133588.

It is an arithmetic number, because the mean of its divisors is an integer number (136237500).

Almost surely, 2^996216661 is an apocalyptic number.

It is an amenable number.

996216661 is a deficient number, since it is larger than the sum of its proper divisors (93683339).

996216661 is a wasteful number, since it uses less digits than its factorization.

996216661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259859.

The product of its digits is 209952, while the sum is 46.

The square root of 996216661 is about 31562.9000727119. The cubic root of 996216661 is about 998.7372932427.

The spelling of 996216661 in words is "nine hundred ninety-six million, two hundred sixteen thousand, six hundred sixty-one".